ABSTRACT

In order to study the influence of associated pyrite interlayer content in coal seam on coal spontaneous combustion, the infrared spectrum of anthracite in Shanxi Yangquan mining area with different content of pyrite was tested by Fourier infrared spectrometer, and the variation law of the influence of the content of associated pyrite on coal surface functional groups was studied. In this paper, the TG, DTG, DSC curves and heat release curves of associated pyrite coal samples during programmed temperature rise were studied by synchronous thermal analyzer experiment. The results show that such features can be found in the spectrum of six coal samples that the aliphatic hydrocarbon content is always higher than that of the AP-0 coal sample. When associated pyrite content is 60%, the content of aromatic hydrocarbons in the AP-0 coal sample is the smallest, and the change of hydroxyl content is the largest. The more vigorous the coal surface functional groups are, the slower the oxidation reaction with oxygen occurs. The higher the content of pyrite associated with the formation of this coal sample, the smaller the relevant weight change during the oxidation reaction. The lower the ignition temperature of coal sample is, the more hematite (Fe₂O₃) is left in the coal residue, and the lower the maximum heat flow rate, the lower the heat release.

摘要

为研究煤层伴生黄铁矿夹层含量对煤自燃的影响，采用傅立叶红外光谱仪对山西阳泉矿区不同硫铁矿含量的无烟煤红外光谱进行了测试，分析了其影响的变化规律。研究了煤表面官能团上伴生黄铁矿的含量。本文通过同步热分析仪实验研究了伴生黄铁矿煤样在程序升温过程中的TG、DTG、DSC曲线和放热曲线。结果表明，在六个煤样的光谱中可以发现脂肪烃含量始终高于AP-0煤样的特征。当伴生黄铁矿含量为60%时，AP-0煤样中芳烃含量最小，羟基含量变化最大。煤表面官能团越活跃，与氧的氧化反应发生得越慢。与该煤样形成相关的黄铁矿含量越高，氧化反应过程中相关的重量变化就越小。煤样着火温度越低，赤铁矿（Fe₂ O ₃ )残留在煤渣中，最大热流率越低，放热越少。